propellant charge的用法和样例：
例句
- The variation of residual energy of propellant in ammunition after long period storage is stud-ied.
对弹药在长期贮存过程中其发射药剩余能量的变化情况进行了研究。 - By the changes of thickness of the crazes with temperature, the burning area of the propellant is changed and the desire discharge rule of the propellant is realized.
通过银纹厚度随温度的变化，调整发射药的燃烧面积，使变燃速发射药具有所希望的能量释放规律。
